[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 --- Comment #13 from CVS Commits --- The master branch has been updated by Marek Polacek : https://gcc.gnu.org/g:be464161b4ae128681958d94aa460531cf30e0a4 commit r11-459-gbe464161b4ae128681958d94aa460531cf30e0a4 Author: Marek Polacek Date: Mon May 18 13:50:39 2020 -0400 c++: Add test for c++/95143 Already fixed by r10-8124-gceae6a13366d9646e172fc943fe8e221b70f0920. PR c++/95143 * g++.dg/cpp0x/sfinae66.C: New test.
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 Richard Biener changed: What|Removed |Added Resolution|--- |FIXED CC||mpolacek at gcc dot gnu.org Status|NEW |RESOLVED --- Comment #12 from Richard Biener --- Thus fixed. Adding the testcase might be nice.
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 --- Comment #11 from Jonathan Wakely --- Possibly fixed as part of PR 94885.
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 Jonathan Wakely changed: What|Removed |Added Known to fail||10.1.0 Keywords||needs-bisection, ||rejects-valid Status|WAITING |NEW Known to work||10.1.1, 11.0, 9.2.0 --- Comment #10 from Jonathan Wakely --- Thanks. Confirmed as a bug in 10.1 but it already seems to be fixed on the gcc-10 branch after the release. I'll bisect it.
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 --- Comment #9 from Bernd Baumanns --- fails with this version: g++-10.1 (GCC) 10.1.0 Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 --- Comment #8 from Bernd Baumanns --- fails with this version: g++ (Compiler-Explorer-Build) 10.1.0 Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Compiler returned: 0 And this: g++-10 (Ubuntu 10-20200417-0ubuntu1) 10.0.1 20200417 (experimental) [master revision a64468a3034:28feadc0609:b835645c7a51b7e99092abe61d677aa491836f95] Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 --- Comment #7 from Bernd Baumanns --- I hope you have now all you need. This bug is only triggered in C++20 mode and with inheritance.
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143
--- Comment #6 from Bernd Baumanns ---
simplified source (without include type_traits):
class false_type
{
public:
static constexpr bool value = false;
};
class true_type{
public:
static constexpr bool value = true;
};
template
T&& declval() noexcept;
template
struct is_static_castable : false_type
{};
template
struct is_static_castable(declval()))> :
true_type
{};
class Base
{};
struct A
{};
class B: public Base
{};
int main()
{
constexpr auto canCast = is_static_castable::value;
static_assert(!canCast);
constexpr auto canCast2 = is_static_castable::value;
static_assert(canCast2);
return 0;
}
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 --- Comment #5 from Bernd Baumanns --- Created attachment 48544 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48544&action=edit source
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 --- Comment #4 from Bernd Baumanns --- Created attachment 48543 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48543&action=edit g++-10 -v -save-temps -std=c++2a /mnt/j/test.cpp
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 --- Comment #3 from Bernd Baumanns --- Created attachment 48541 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48541&action=edit ii file
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 Jonathan Wakely changed: What|Removed |Added Ever confirmed|0 |1 Last reconfirmed||2020-05-14 Status|UNCONFIRMED |WAITING --- Comment #2 from Jonathan Wakely --- Please read https://gcc.gnu.org/bugs (as requested when creating a bug) and provide the missing information.
[Bug c++/95143] SFINAE failure with static_cast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95143 Bernd Baumanns changed: What|Removed |Added URL||https://godbolt.org/z/yVjQf ||9 --- Comment #1 from Bernd Baumanns --- https://godbolt.org/z/FRznAh
